Timezone Converter
See a single moment in time across timezones — DST-aware, processed locally.
Toggle to watch every zone tick in real time.
About Timezone Converter
Scheduling across regions is error-prone because offsets change with daylight saving time and differ by country. A meeting at 9:00 in Seoul is a different local time in New York depending on the time of year.
This converter shows a single moment in time across several cities, including Seoul, Tokyo, New York, Los Angeles, London, and Berlin, taking daylight saving into account. It uses your browser's time zone database, so results follow the current rules for each region.
Common use cases
- Planning a meeting between teams in different countries.
- Working out when a release or deadline lands in another region.
- Converting a timestamp from a log to local time.
- Checking the effect of daylight saving changes.
Frequently asked questions
- Why does the offset between two cities change during the year?
- Some regions observe daylight saving time and others do not, and the changeover dates differ, so the gap can shift.
- What is the difference between UTC and GMT?
- For everyday purposes they are the same. UTC is the modern standard, while GMT is a time zone used in the United Kingdom in winter.
- Which time zone data does it use?
- The IANA time zone database built into your browser.
- What input formats does it accept?
- A plain date and time interpreted in the source zone you pick, an ISO 8601 string with its own offset or Z suffix (which is used as-is, ignoring the source zone selector), or a number treated as a Unix epoch in seconds or milliseconds, detected automatically from its length.